1 files changed, 84 insertions, 0 deletions
diff --git a/python/problems/while_and_if/checking_account/common.py b/python/problems/while_and_if/checking_account/common.py
new file mode 100644
index 0000000..610bbfc
--- /dev/null
+++ b/python/problems/while_and_if/checking_account/common.py
@@ -0,0 +1,84 @@
+# coding=utf-8
+
+from python.util import has_token_sequence, string_almost_equal, \
+    string_contains_number, get_tokens, get_numbers, get_exception_desc
+from server.hints import Hint, HintSequence
+
+id = 200
+group = 'while_and_if'
+number = 5
+visible = True
+
+solution = '''\
+stanje = 0
+while stanje > -100:
+    stanje += int(input('Sprememba '))
+    print('Stanje', stanje)
+print('Bankrot')
+'''
+
+hint_type = {
+    'while_clause': Hint('while_clause'),
+    'while_condition': Hint('while_condition'),
+}
+
+def test(python, code):
+    # List of inputs: (expression to eval, stdin).
+    test_in = [
+        (None, '23\n15\n-30\n10\n100\n-200\n-50\n'),
+        (None, '10\n-100\n1000\n-10000\n'),
+        (None, '1\n2\n'),
+        (None, '-1000\n'),
+        (None, '0\n'),
+    ]
+
+    test_out = [
+        (-132, True),
+        (-9090, True),
+        (3, False),
+        (-1000, True),
+        (0, False),
+    ]
+
+    # List of outputs: (expression result, stdout, stderr, exception).
+    answers = python(code=code, inputs=test_in, timeout=1.0)
+    outputs = [ans[1] for ans in answers]
+
+    n_correct = 0
+    tin = None
+    for i, (output, correct) in enumerate(zip(outputs, test_out)):
+        if string_almost_equal(output, correct[0]) and \
+           ('Bankrot' in output) == correct[1]:
+            n_correct += 1
+        else:
+            tin = test_in[i][1]
+            tout = correct
+
+    passed = n_correct == len(test_in)
+    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
+    if tin:
+        hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin),
+                                                              'sum': str(tout[0]),
+                                                              'bancrupt': str(tout[1])}})
+    return passed, hints
+
+def hint(python, code):
+    tokens = get_tokens(code)
+
+    # run one test first to see if there are any exceptions
+    test_in = [(None, '23\n15\n-30\n8\n10\n100\n-200\n-50\n')]
+    answer = python(code=code, inputs=test_in, timeout=1.0)
+    exc = get_exception_desc(answer[0][3])
+    if exc:
+        return exc
+
+    # student does not have while or for: instruct him on loops
+    if not has_token_sequence(tokens, ['while']) and \
+       not has_token_sequence(tokens, ['for']):
+        return [{'id' : 'while_clause'}]
+
+    # student's answer is not correct
+    if not string_almost_equal(answer[0][1], -132):
+        return [{'id' : 'while_condition'}]
+
+    return None